3485357 - SAML2 : Error "Parameter 0 was either incorrectly set or not set in method CONVERT_NAMEID" and how to fix

SAML2 is not working after standard configuration  and the error in the SAML trace states "Parameter 0 was either incorrectly set or not set in method CONVERT_NAMEID."

SEC_DIAG_TOOL:

SAML20 SP (client 100 ): Exception raised:
SAML20 SAML20 CX_SAML20_CORE: Parameter 0 was either incorrectly set or not set in method CONVERT_NAMEID. Long text: SAML20     at CL_SAML20_ENTITY->CONVERT_NAMEID(Line 14)
SAML20     at CL_SAML20_AUTHN_REQUEST->SET_ATTRIBUTES(Line 117)
SAML20     at CL_SAML20_SSO->CREATE_AUTHN_REQUEST(Line 144)
SAML20     at CL_HTTP_SAML20->PROCESS_LOGON(Line 585)
SAML20     at CL_ICF_SAML_LOGIN->PROCESS_LOGON(Line 63)
SAML20     at CL_HTTP_SERVER_NET->AUTHENTICATION(Line 2405)

SAP ABAP NetWeaver(All)

SAML2, SAML2_NAME_FMT, Client copy, CONVERT_NAMEID , KBA , BC-SEC-LGN-SML , SAML 2.0 for ABAP , Problem